Redeemed costco 12 month offer with extra 3 months, but not seeing extra 3 months

The extra 3 months are part of a partner/third‑party promotional offer. These unique partner offers are managed by the retailer (Costco) and not directly by Microsoft.

To resolve this:

1. First, confirm what Microsoft currently shows for the subscription:
   • Go to the Services & subscriptions page.
   • Sign in with the same Microsoft account used to redeem the Costco code.
   • Check the subscription’s expiration date and whether recurring billing is turned on.
2. If the expiration date still shows only 12 months and not 15 months, contact Costco (the third‑party retailer) directly. For subscriptions purchased with recurring billing from a third‑party retailer, only the retailer can correct or honor the promotional term.
3. If Costco confirms everything is correct on their side but the Microsoft account still shows the wrong date, contact Microsoft Support and provide proof of the Costco promotion and purchase so they can review the subscription details.

If the subscription was purchased specifically for the partner offer and the extra months cannot be honored, the subscription can be cancelled following the steps at the Microsoft 365 cancellation page referenced below, or via the retailer if it was fully managed by them.

References:

• End of support for Partner Offers FAQ
• End of support for Money in Excel, Wolfram data types, and Partner offers
• Excel Data Types with Wolfram End of Support FAQ
• Problems renewing a Microsoft 365 subscription
• A subscription notice appears when I open a Microsoft 365 application